S18A0042abst
S18A0042
We uncovered the existence of galaxies with strong Lyman continuum (LyC) emission in the SSA22 field, the proto-cluster region at zβΌ3.1, through the special narrow-band (NB) imaging with Suprime-Cam. Our result shows that fraction of such strong LyC emitters is β8.5%, but other studies clam much smaller rate of strong LyC sources among high-z star-forming galaxies. This apparent conflict may indicate either (1) UV luminosity dependence of LyC escape fraction, or (2) in the SSA22 massive concentration of star-forming galaxies enhance LyC escape. To address the question, we carried out zβΌ3 LyC search in the GOODS-N (general field), and detected 22 LyC galaxy candidates. Here we propose K-band spectroscopy of them. The goals are (1) to clarify their redshifts by identification of [Oiii] doublet or HΞ² and to eliminate foreground contaminations and (2) to measure strength of [Oiii] emission to test the idea of hard ionizing radiation from LyC sources through comparison with the control sample star-forming galaxies in the same masks. Our past experiences show that MOSFIRE is the most efficient instrument to carry out follow-up spectroscopy to identify LyC galaxies and to eliminate foreground contaminations.
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